Contact for electric lamps



(No Model.)

H. EDMUNDS, Jr. CONTACT FOR ELEGTRIG LAMPS.

Patented Nov. 13, 1885 Paws MW. Was numm 0.0

' UNITE S'rn'rns Harem @rricn.

HENRY EDMUNDS, JR, OF NEW YORK, N. Y., ASSIGNOE TO THOMAS J.

MONTGOMERY, OF BOSTON, MASSACHUSETTS.

VCONTACT FoR ELECTRIC LAMPS.

SPECIFICATION formingpart of Letters Patent Nol 288,217, dated November13, 1883.

. Application filed April 5, 1883. (No model.)

To all whom, it may concern.-

Be it known that I, HENRY EDMUNDS, J r., of the city and State of NewYork, have invented an Improvement in Contacts for Electric Lamps, ofwhich the following is a specification.

This improvement relates to a peculiar spring-contact thatis employedfor incandescent electric lamps to close or break the circuit by apartial rotation ofthe base of the lamp.

In the drawings, Figure 1 is anelevation of the lamp complete. Fig. 2 isa section of the base. Fig. 3 is an inverted plan of the base,

and Fig. "4 is a plan of the cup. a

The electric lamp A is of any desired construction. Ihave shown the sameas provided with a coiled filament within a glass globe that issupported by a spring, 0, above the base B, and the spring-hooks (2 formthe conductors within the base B.

The metallic cup F, with its inclosed insulat ing block S, is screwedupon the tubular support G, and within the cup and upon the uppersurface of the block S are the contactplates 1 1-, having studs 0 0projecting up from the faces, and these contact blocks are attached byscrews 1;, which also serve to clamp the naked ends of the insulatedconductors 7r, that pass through the tube G.

Upon the under surface of the base B there are the spring-contact platesat n, and the conductors d are connected with these spring-contacts bybeing passed around under the screwheads and clamped thereby. The lowerend of the base B enters into the cup F, and there is a shoulder at 2around this base, and a helical spring, p, is introduced between the topby a sliding motion that insures perfect Ineedge of the cup F and thisshoulder 2. There is a tubular case, on, around the cup F and 4 base B.At the lower part it is attached to the cup F by screws 3 or bybayonet-lock pins 4, and screws 3, to prevent the parts turning, and toallow for said parts being separated when necessary. Intheupper part ofthe case '4 m there are slots 5 placed diagonally, and screws 6, passinginto the base 13. By this con-- struction I am able to turn on thecurrent by giving the base 13 a partial rotation. In the normal positionof the parts, with the screws 6 at the upper ends of the slots5, theelectric lamp is raised in the position indicated, by

dotted lines, Fig. 1, and the springs 12 n are out of, contact with thestuds 0 0, and hence the circuit is broken. when the base B is par-.tially revolved, so as to bring the parts into the positions shown byfull lines, the screws 6, passing down the inclines of the slots, bringthe springs n a into contact with the studs 0 o talliecontact, and alsokeeps the surfaces clean.

I claim as-1nyinvention The combination, with the electric lamp A, andits base B, of the cup F, the spring 19 between the upper end of the cupand the base, the case at, attached to the cup, and having inclinedslots, the pins or screws 6, the springcontacts a n, the plates Z l, andstuds 0 0, and the electric conductors is, substantially as set forth. 1

Signed by me this 29th day of March A. D. 1883.

HENRY EDMUNDS, JR.

Witnesses:

GEO. T. PINOKNEY, W'ILLIAM G. Mora.

